Mug tree



FIG. 1 is a top plan view of a mug tree showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a side elevational view thereof; and,

FIG. 5 is a perspective view thereof. 

CLAIM The ornamental design for a mug tree, as shown and described. 